1998 JAGUAR X308 bulb

Exterior Lighting - Exterior Lighting
Description and Operation
A multi-function switch located on the left stalk of the steering column switch assembly permits selection of either parking
(side), headlamps, auto-headlamp or off. Selection of a particular mode provides the appropriate input to the body
processor module (BPM).
Where the auto headlamp function is incorporated, a light sensor in the interior rear view mirror monitors ambient light and
provides an input to the BPM. The BPM responds by switching the low beam headlamps on or off as appropriate for the
prevailing light conditions.
The front and rear fog lamp switch is located on the fascia outboard of the steering column.
Front Lamps

Headlamp assembly
Each headlamp assembly consists of tw o headlamp units. The dipped beam lamp unit is located outboard and the main
beam lamp unit located inboard also carries the front parking (side) lamp. Access for bulb replacement is from the engine
compartment.
ItemPart NumberDescription
1—Headlamp (dip beam)
2—Headlamp (main beam)
3—Front Parking (side) Lamp
4—Front Direction Indicator
5—Front Side Marker
6—Side Repeater Lamp
7—Fog Lamp

License plate lamps
Each license plate bulb is accessible after removing the relevant lens. The license plate lamps can be accessed following
removal of the trunk lid liner and upper trim finisher.
Rear lamp assembly
Each rear lamp assembly incorporates a stop/tail lamp, a fog lamp, a reversing lamp and a direction indicator lamp. Access
for bulb replacement is from the trunk.
Side markers
Each side marker is retained in the bumper cover by a lug on one end of the unit and a spring clip at the other end. The unit is not electrically connected for all markets.
High mounted stop lamp
The high mounted stop lamp (HMSL) is secu red to studs on the center lower edge of the backlight and provides illumination
using five bulbs.
Operation
All lamps are controlled by the BPM which pr ovides an appropriate output in response to an input received when a selected
switch is operated.
The side marker lamps receive an input from the BPM via relay 3 and fuse F21. The license plate lamps receive an input
from the BPM via relay 3 and fuse F19. The rela y and fuses are located in the trunk fuse-box.
The tail lamps receive an input direct from the BPM.
The stop, reversing and rear fog lamps are controlled by the security and locking module (SLM) which receives inputs via
the SCP network from the BPM.
The HMSL is not controlled by the SLM; it receives input from the brake switch via relay 5 and fuse F8 in the trunk fuse-box.

The BPM and SLM monitor the stop lamps (n ot HMSL) and tail lamps for failure.
Fault analysis must be undertaken using the PDU, refer to Diagnosis and Testing.
Consult the relevant Electrical Guid e for details of circuit operation.


2—Rear Lamp Assembly
3—Rear Side Marker
4—High Mounted Stop Lamp

Exterior Lighting - Exterior Lighting
Diagnosis and Testing
Tests Using the Portable Diagnostic Unit
Refer to PDU User Guide
The complexity of the electronics involved with the various Electronic Control Modules and the multiplexed communication
networks, preclude the use of workshop general electrical test equipment. Therefore, reference should be made to the PDU
User Guide for detailed inst ructions on testing the exterior lamps and circuits.
The PDU systematically tests and analyses the lamp assemblies, the bulbs and the electrical connections to them. It should
be noted that the lamps are not wired direct ly to the switches. Actuation of a switch provides an input signal to the Body
Processor which interpre ts the signal as a request to switch output from the Bo dy Processor, either directly or indirectly to a
specific lamp.
Where a fault involving a lamp is indicated by the PDU, befo re replacing the component, some basic diagnostic methods
may be necessary to confirm that connections are good and that wiring is not damaged.

Exterior Lighting - Front Fog Lamp Bulb
Removal and Installation
Removal
Installation

1.
Remove undertray for ac cess. Refer to 76.22.90.

2. Disconnect fog lamp harness multiplug.

3. Rotate bulb holder 1/4 turn counter-clockwise to release and
remove from lamp assembly.
4. CAUTION: If bulb is to be re -fitted, the glass must not be
touched with the bare hand. Failure to observe this caution will
result in premature bulb failure.
Remove bulb from holder.
1. CAUTION: Fog lamp bulbs are of the halogen type and
must not be touched with bare hands. Failure to observe this
caution will result in premature bulb failure.
Install bulb in holder.
2. Install bulb holder in lamp assembly and rotate 1/4 turn
clockwise to fully seat and engage.
3. Connect fog lamp harness multiplug.
4. Install undertray. Refer to 76.22.90.

Exterior Lighting - Front Side Marker Lamp Bulb
Removal and Installation
Removal

1. Applying firm hand pressure to front end, pivot lamp assembly
for access to rear end.

2. Exercising care to avoid dama ging paintwork, use a small
screwdriver at rear end of lamp, to press and release retaining
tang.

3. Withdraw lamp from bumper for access and disconnect harness multiplug.

4. Rotate bulb holder 1/4 turn counter-clockwise to release it
from lamp assembly.
5. Withdraw bulb from holder.

Installation



1. Install bulb in holder.
2. Install bulb and bulb holder in lamp assembly and rotate 1/4
turn clockwise to seat and retain.
3. Position direction lamp at bumper aperture and connect
harness multiplug.
4. Engage front end tang of lamp in bumper aperture.
5. Pivot lamp assembly and firmly seat rear retaining clip in
bumper aperture.

Exterior Lighting - Front Turn Signal Lamp Bulb
Removal and Installation
Removal

1. Applying firm hand pressure to inner end, pivot indicator lamp
assembly for access to outer end.

2. Exercising care to avoid dama ging paintwork, use a small
screwdriver at outer end of lamp, to press and release retaining clip.

3. Withdraw lamp from bumper for access and disconnect harness multiplug.

4. Rotate bulb holder 1/8 turn to release it from lamp assembly.
5. Withdraw bulb holder and remove bulb.

Installation



1. Install bulb in holder.
2. Install bulb and bulb holder in lamp assembly and rotate 1/4
turn to seat and retain.
3. Position direction indicator la mp at bumper aperture and
connect harness multiplug.
4. Engage inner end tang of lamp in bumper aperture.
5. Pivot lamp assembly and firmly seat outer retaining clip in
bumper aperture.